Merge "[Stability][hwui] check mmap return value"

am: b352dcd153

Change-Id: I8d04c5433ca881e62a23e0aa13e022cdf8d16d9a

libs/hwui/service/GraphicsStatsService.cpp

@@ -127,7 +127,7 @@ bool GraphicsStatsService::parseFromFile(const std::string& path,
         return false;
     }
     void* addr = mmap(nullptr, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
-    if (!addr) {
+    if (addr == MAP_FAILED) {
         int err = errno;
         // The file not existing is normal for addToDump(), so only log if
         // we get an unexpected error